Motor suspension



noma susPENsIoN Filed Nov. 16, 1934'.

OMMMMJ:

Patented Feb. 2, 1937 PATENT OFFICE MOTOR SUSPENSION y Carroll A. Brinkert, Detroit, Mich., assigner to' The Timken Silent Automatic Company, Detroit, Mich., a corporation of Michigan Application November 16, 1934, seria1N0. 753,377 9 claims. (C1. 24a- 18) A number of complaints have been made to y manufacturers of liquid fuel burners by owners 10 of domestic' installations on account of noises which have been traced to the burner motor. It seems that the electric motors which actuate the burner mechanisms, no matter how Well they are made and due to their rapid rate of rotation, set up certain vibrations. The burner is usually installed in the basement of a building and whererigid motor mountings are used or other than rigid mountings of types which are ineffective to eliminate noise are used, the vibrations set up by the burner motor Vtravel upwardly through the building and are accentuated in one or more places of the upper structure to the annoyance of the occupants.

The attempted remedy for such a situation has been to install another motor. As all motors do not have the same vibration characteristics, the replacement motor may or-may not correct the noises apparent in the building. On occasion, as many as ten to fifteen motors have been installed in a single dwelling in an effort to correct the noises. Also, in some cases, elimination of such noise is impossible by merely substituting another motor as some dwellings and other buildings are more susceptible to vibration noise accentuation -35 than others.

Many means of damping motor vibrations have been tried, among the most prominent of which is using a, resilient coupling on the motor shaft and mounting the motor in rubber. Coil springs 40 for supporting the motor have also been tried as well as horizontally-placed at springs, but withA only indifferent success, as such designs have failed to retain the motor in its truexrunning position and have caused out-of-balace rotation. 45 My invention to be described hereinafter effectively corrects the above-noted noise conditions,

and also avoids the defects of prior devices.

It is the primary object of thishinvention to provide an improved resilient connection between an 50 actuating means together with the rotatable desuspended from the fuel oil distributing means. More specifically in this connection, it is an object to provide improved suspending means consisting of flat spring members having their iiat portions in radial planes and their longitudinal axes in 5 vertical planes. l

It is a further object to provide in'a motor mounting, vertical, flat motor suspending springs whose vfiat surfaces lie in radial planes which intersect in a single line and which line is substan- 10 tially coincident with the longitudinal axis of the motor which is preferably of the type employing two'bearings.

In prior devices incorporating a resilient su`pporting means, the upper portion of the motor 15 hasbeen subjected to excessive heat transmitted from the combustion gases. This has resulted in a'motor design wherein a single bearing, located at the lower end of the-motor is all that is provided. This is due to the fact that the excessive 20 temperatures would impair the eiliciency of upper bearings. It has not been feasible or practicable in prior devices to shield the upper portion of the motor Afrom heat due to the cumbersome resilient supporting means heretofore provided. 25

Therefore, it is a further object to provide ymeans in a burner' motor suspension whereby the` resilient suspending means is protected from the high temperatures of the combustion gases.

It is a further object to provide a resiliently sus- 30 pended motorhaving a plurality of spaced bearings, atI least one of which is adjacent `the resilient suspending means and protected against the high temperatures of the combustion gases.

In the preferred embodiment of the inyention I provide a motor incorporating the novel mounting -as a portion of the motor proper whereby the motor is interchangeable with and may replace the motor of existing installations; and it isalso within the scope of my present invention to modify 40 existing installations by the addition of the novel motor mounting to be disclosed.

Therefore it is a still further object of my invention to provide a motor mounting so designed that it can be applied to burner installations alyready in use to eliminate all objectionable noise thereof in operation.

The above and further objects will be apparent .upon a study of the following description andthe appended claims when taken inconnection with the accompanying drawing wherein:

Figure l is an elevational view, sectioned in part, of a liquid fuel and airdistributing means for fuel burning apparatus incorporating my invention;

Referring now to the drawing wherein lil'rel reference characters refer to like parts wherever they occur and with particular reference to Figure 1, the oil and air. distributing means consists essentially of a frame A, a rotary burner head mechanism B and an electric motor M in?.

cluding a casing C.

It is'to be understood that this invention may be applied to any kind of apparatus wherein the actuating means or electric motor is flexibly or resiliently suspended. For the purpose o f accesos stationary conical member and an inner rotatable conical member. Said members are aperturd at intervals so that the amount of opening through which the air .may'enter maybe controlled by moving the inner conicalmember with respect to the outer.

The motor shaft extends within the motor `M and carries an armature in a conventional manner. 'Ihe shaft has a supporting lbearing at its -lower end in the bottom of the motor casing and near its upper end it is fitted in a sleeve description, I have shown myV invention in connection with theburner.mechanism disclosed in,`

the'Herbert W. Alden and Milton A. Powers Patent No. 1,882,694 which issued October` 18,

1932.. Reference may be had to this Alden and Powers patentV for a more detailed descrip- Vtion of the apparatus than will appear hereinafter.

s 'I'he burner frame A is supported by three adjustable legs I. Said frame comprises a circular metallic ring having three bosses 43 with blind holes therein for the insertion of the legs I. 'Inwardly of and concentric with said ring is a split circular collar 5 which is integrally connected to said ring by means of radialribs 1 and has bosses 9 at the split portion which have aligned apertures therethrough. Inserted within the split circularicollar 5 is a lower `portion II-cylindrical in formof the oil inlet casting I3.- Clamp bolts. I5 are inserted through the aligned apertures of bosses 9 thereby sup- .portlng and positioning said oil inlet casting. y The inlet casting I3 has the aforementioned cylindrical portion II at its lower end which -tapers inwardly at one side adjacent the upper end thereof as indicated by reference character I5 to allow clearance for an inlet pipe. The cylindrlcal portion II ends in a horizontal wall I4 and the casting I3 is of minimum diameter above the wall I4'. The upper end of the' cylindrical member II provides anannular space I1 interrupted onlyV bytheftapering portion l5, the said annular space terminating -abruptly in the previously described wall I4. Spaced radial slots I9. the purposeof which will appear herelnafter, are provided in the .horizontal wall I4.

The upper portion -2l of the 'oil inlet casting I3 is cup-like in shape and has a central raised boss '23 which is centrally apertured as at 25.

Leading angularly into the cup-like portion 2| and adjacent its rim are two apertures to which are fitted an oil inlet pipe 21 andan oil drain pipe.29. Fitted into the upper portion of the aperture which is fed by the oil inlet pipe 21 is a suitable means-not .shown--for transmitting theoil to the distributor cup 3|. Said distributor cup is fitted around its upper periphery with spaced finger tubes 33. The distributor cup 3| is supported on and driven by the upper portion of the motor shaft 35. Resting upon the upper portion of`di'stributor'cup 3i and also driven by motor shaft 35 is a -fan 31 having vertical blades 39 projecting downwardly Vatits outer periphery. Distributor cup 3l and fan 31 are .clamped to the motor ,shaft 35 by 4means of abolt 4I or equivalent ,suitable for the purpose.Y 'Ihe quantity of'air admitted tothe Vburner mechanism is 'governed by aconical air shutter mechanism 43 .consisting of an outer l bearing 45. An oil reservoir 41 is provided below the bearing 45 in the. motor casing and suitable means, such as a wick 48, utilized as shown in Powers Patent 1,888,693, may be provided for carrying lubricant to the bearing. The motor casing. which contains the motor field, has a cylindrical upper portion 49, which carries the 'bearing 45. The portion 49 of the motor extends within the cylindrical'portion II .of the.

#fthe cylindrical part of the motor.

The springs are flat strips of suitable spring material and may be strips of oil tempered spring steeleach having one end thereof bent at-right angles. The bent end of each spring has an aperture therethrough for the insertion of a cap screw 53. Clamped between each cap screw 53 and each spring 551s a relatively stiff clamping member 51 which insures that the bent portions -of the springs 55 will be uniformly clamped to the surface 5I throughout their registering area.

At the opposite -end of each spring 55 is a second aperture which is adapted to receive a lcap screw 59.- These `screws -59 are inserted into threaded aperturesprovided therefor in the oil inlet casting I3. The casting I3 is provided with vertical walls 5I in=line with the previously mentioned slots I9 so that when springs 55 are inserted through the slots, their upper portions will be in register with the walls 5I. Immediately above and in line with thethreaded apertures in thewalls 5I are apertures 63 to receive pins 54 each of which cooperates with a notch 55 formed in the upper endof each spring 55 to thus form aulocking means.

y As clearly shown by Figure 2, the springs 55'are placed radially with respect to the axis of motor shaft 35. In other words, the direction in which springs 55 will ex is coincident with'the direction of the torquing forces ofthe motor C. The

springs are designed to be of such stiffness that they will not permit the motor frame to revolve too far with respect to the oil inlet casting. In

preferred practice the permissible relative rotational movement is restricted to approximately no olf-center running of the motor.l -Should the screws 59 become loosened, which'is' a remote 1 possibility, and permi movement ofthe motor in lar 5, and the casting 'I3 constructed in accord- 'tion may be applied to existing installations, the

form of mounting shown permitting such replacement readily to be made. The cylindrical portion II of the oil inlet casting 'I3 as previously explained is rigidly clamped in the circular; colance with the present invention may be used in place of the part 24 illustrated in the patent previously ,referred to. A motor fitted to receive the springs 55 in the manner disclosed herein can then be used to drive the fan 31 and the distributor cup 3l A In the 'event that the motor and casting I3- are Vshipped as anassembled unit, strain on the springs 55 is prevented by the limited clearance between the outside of the cylindrical oil reservoir 4'I of the motor proper and the inside diam-A eter of the encircling collar II. Anyv side thrust on the motor such as might occur f rom handling .on the motor during shipping or handling and the weight of the motor and the parts carried thereby in normal operation is readily taken by the springs 55 as they are amply strong in tension. Any upward movement of the vmotor C which might occur during handling or shipping is absrbed by a slight bowing of the springs. Upward movement is definitely limited by contact between the top of the cylindrical portion 49 and the flat surface adjacent the point of reduced diameter I4.

In the arrangement described, practically vthe entire operating portion of the springs 551s venclosed within the oil inlet casting I3. Spring material such as steel and the like loses its temper when it `is subjected to excessive temperatures,

but the shielding herein obtained practically`v eliminates the possibility of any decrease in ef' From the foregoing description it is evident that this invention provides' a motor suspension which eectively absorbs torque impulses and which will not transmit vibrational disturbances. It is also evident that the motor suspending means' is .effectively shielded against excessive heat transmission and that the upper motor bearing is also protected against high temperatures.

The invention may be embodied in other specie forms without. departing from the spirit or essential characteristics thereof. The present embodiment is'therefore to be considered in all respects as illustrative and not restrictive, the

scope of the invention being indicated by .the appended .claims rather than the foregoing description, and all changes which come within the meaning and range of equivalency of the'claims are therefore intended to be embraced therein.

What. is claimed and desired to be secured b United States Letters Patent is: l

1. In combination, a motor having a vertical shaft, a supporting frame comprising a supporting clamp, a stationary member apertured to .provide an opening through which said shaft extends upwardly, said member comprising a A'hollow skirt portion depending from'an integral member.

supported in said clamp, said motor having a projecting nosing received within said skirt portion, and resilient means housed by said skirt and suspending said'motor nosing from said upper portion of said member.-

2. A motor and mounting assembly for a fluid fuel burner or the like comprising a motor having a casing and a shaft adapted to receive a driven member at its upper end, a stationary member disposed between said casing and said Aupper end of the shaft and having ya depending hollow skirt portion, said motor casing having 'a projectingnosing 'of -decreased size received within said skirt portion, and resilient means housed between said nosing and said skirt portion and wholly by itself suspending said motor from said stationary'member, said assembly thereby being adapted for suspension as a compact and noiseless unit from any fixed supporting structure. 1

3. In a liquid fuel burner having a motor, a supportingframe, a stationary member comprising a hollow skirt like portion adapted to surroundsaid'motor at its upper end, said hollow portion being connected to said frame, an upper 'portion on said stationary member, and

a horizontal wall between said skirt and said v upper portion, circumferentially spaced radial slots in said wall, and spring elements for suspending said motor from said stationary member, said spring elementsbeing connected to said motor at circumferentially spaced points and projecting upwardly through said slots and secured to said upper .portion of said stationary 4. In a liquid fuel burner having a motor, la supporting frame, a stationary member comprising'l a lower hollow skirt like portion terminating in an upper horizontal wall' and tapering at one side adjacent its upper end and adapted to surround the upper end of said motor to provide an annular space, a cup like upper portion and an intermediate portion on said stationary member, said hollow portion being connected to "said frame, circumferentially spaced radially disposed slots in the horizontal wall of said hollow portion, and spring elements connected to said motor at circumferentially spaced'points for sus pending said motor from saidvstationary member,

A each of said spring elements being housed with-L in said annular space and projecting upwardly through one of said slots, the upper ends of said spring elements .being secured against vertical vradial' wallsconnecting said cup like portion to said skirt.

5. In a motor suspension, an overhead support; an electric motor disposed vertically and having a housing with its top end reduced in diameter and arranged below said support, said top end having several fiat horizontal surface -portions relatively close to the motor axis; and' means for suspending said motor from said support; said means comprising flat spring elements eachvertically arranged for cpnnection at one end with said support and having-a horizontally oiset portion at its other end for connection with one of said flat horizontal surface portions of the thru said` spring and s aidvertical portion, and

means for preventing the spring from swinging about said fastening element. Y

7.'In a motor suspension, an overhead support; a vertically arranged electric motor provided with a housing that is very materially ref duced in diameter at its upper end; said support including a skirt of but slightly larger diameter than said reduced upper end of the housing and surrounding the latter; and a set of at vertical said support in spaced relation to said reduced above said bearing by means extending inwardly toward the motor shaft 'and affording several vvertical openings;` and several elongated ele- -ments exibly suspending said motor housing from said support, each element being connected to the support `at one end and projecting downwardly through one of said openings and through the space formed between said skirtl and said reduced extension into connection with said housing at its other end.

9. In the combination dened in claim 8, said elongated elements being in the form of at bands with their side surfaces arranged substantially radially of the motor axis. and with their lower ends securely held in engagement with the top of the upper end of the motor housing.

extension, said skirt being joined to the vsupportv CARROLL A. BRINKER'VI'. zo 

